.col-md-12 {
  grid-column: span 12;
}
.col-md-11 {
  grid-column: span 11;
}
.col-md-10 {
  grid-column: span 10;
}
.col-md-9 {
  grid-column: span 9;
}
.col-md-8 {
  grid-column: span 8;
}
.col-md-7 {
  grid-column: span 7;
}
.col-md-6 {
  grid-column: span 6;
}
.col-md-5 {
  grid-column: span 5;
}
.col-md-4 {
  grid-column: span 4;
}
.col-md-3 {
  grid-column: span 3;
}
.col-md-2 {
  grid-column: span 2;
}
.col-md-1 {
  grid-column: span 1;
}
.central {
  width: 930px;
  margin: 2rem auto;
  padding: 1rem;
  box-sizing: border-box;
}
